From nobody Fri Sep 25 10:03:25 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D5C7234D3B2; Sun, 20 Sep 2026 07:40:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789890006; cv=none; b=Jw3PeLgZ/nRq+nLOEEFZJLee1uwHBoQy9KWjPsXsznnVBGIFcIUgnPnBdzAAAXWo/CpjNQ6sGdGf92Wc5GMs9xe8Dlhoa7+wi28tcV64hEp/6WbCHt2txlChDONfvN5ugUtT0bvotHWVRc3QN+KNvYQljA1y2tlZcr37YIU02Bs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789890006; c=relaxed/simple; bh=A32RFvRAq+A5909utLmA2thv38Nr8c/zbKxElRWUN0E=; h=Subject:To:Cc:From:Date:In-Reply-To:Message-ID:MIME-Version: Content-Type; b=tD5ODG61pYSzlD6TNF3Mc/mR6MKQNOt9KZmGX4LwEYzEDSSdfysPPtMcnEU6E9d6m/5S6tTXWxb3cpwicqbSiXLJgNQcxTU7l7GUtvcASiALJq+1auVtdkthwgitoDILXeWl+OtpSUsc6MoHLQAZByNmIc+wR340SGnN9KtNk8s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tv1Ksk00; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="tv1Ksk00" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33FA71F000FF; Sun, 20 Sep 2026 07:40:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789890004; bh=wKWq8IVMNEyxPICkXxfZLOnh/fcYJlWkL5pkc7HWXc8=; h=Subject:To:Cc:From:Date:In-Reply-To; b=tv1Ksk004EosJv0NKkZc83oaXPpdYe6lWFS6rQKAXJOFhZLUC1jVb/ZurzWe9JYL6 W5dcMBcNjZbXcudY8gQnuWrzcKErmBbP/uGuVuEOlEw9/2c4NSG7treOVDSs1IH28Z re6yEiDQzNc3yRJ3K2sprZrulPzR53z37KVvTbI4= Subject: Patch "mptcp: close race between scheduler and state change" has been added to the 6.6-stable tree To: gregkh@linuxfoundation.org,kuba@kernel.org,matttbe@kernel.org,mptcp@lists.linux.dev,pabeni@redhat.com,sashal@kernel.org,shardul.b@mpiricsoftware.com,xinyang@anthropic.com Cc: From: Date: Sun, 20 Sep 2026 09:36:36 +0200 In-Reply-To: <20260919200554.2005069-7-matttbe@kernel.org> Message-ID: <2026092035-flask-snowboard-e5a3@gregkh> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-stable: commit X-Patchwork-Hint: ignore Content-Type: text/plain; charset="utf-8" This is a note to let you know that I've just added the patch titled mptcp: close race between scheduler and state change to the 6.6-stable tree which can be found at: http://www.kernel.org/git/?p=3Dlinux/kernel/git/stable/stable-queue.git= ;a=3Dsummary The filename of the patch is: mptcp-close-race-between-scheduler-and-state-change.patch and it can be found in the queue-6.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From stable+bounces-338605-greg=3Dkroah.com@vger.kernel.org Sat Sep 19 22:0= 6:18 2026 From: "Matthieu Baerts (NGI0)" Date: Sat, 19 Sep 2026 22:05:57 +0200 Subject: mptcp: close race between scheduler and state change To: mptcp@lists.linux.dev, stable@vger.kernel.org, gregkh@linuxfoundation.o= rg Cc: Paolo Abeni , sashal@kernel.org, Shardul Bankar , Xinyang Ge , "Matthieu B= aerts (NGI0)" , Jakub Kicinski Message-ID: <20260919200554.2005069-7-matttbe@kernel.org> From: Paolo Abeni commit 42064de57fb83231fcc89663a94885f228a1ee53 upstream. The mptcp scheduler may race with subflow sockets state change: data transmission on the selected socket may fail and a later release could try to use mss_now reset to 0 for a divide operation. Address the issue by explicitly checking for the critical scenario. Fixes: c886d70286bf ("mptcp: do not queue data on closed subflows") Cc: stable@vger.kernel.org Reported-by: Shardul Bankar Reported-by: Xinyang Ge Closes: https://lore.kernel.org/20260525194828.1137119-1-shardul.b@mpiricso= ftware.com Signed-off-by: Paolo Abeni Reviewed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20260917-net-mptcp-misc-fixes-7-3-rc4-v2-2-0= cf5c72667c8@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman --- net/mptcp/protocol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1562,7 +1562,9 @@ struct sock *mptcp_subflow_get_send(stru =20 static void mptcp_push_release(struct sock *ssk, struct mptcp_sendmsg_info= *info) { - tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, info->size_goal); + if (info->mss_now) + tcp_push(ssk, 0, info->mss_now, tcp_sk(ssk)->nonagle, + info->size_goal); release_sock(ssk); } =20 Patches currently in stable-queue which might be from matttbe@kernel.org are queue-6.6/selftests-mptcp-fix-an-uaf-in-mptcp_connect.c.patch queue-6.6/mptcp-fix-bad-accounting-in-__mptcp_subflow_push_pending.patch queue-6.6/mptcp-syncookies-remember-the-request-backup-flag.patch queue-6.6/mptcp-close-race-between-scheduler-and-state-change.patch queue-6.6/mptcp-avoid-unneeded-actions-on-subflow-reset.patch queue-6.6/mptcp-options-handle-mpc-data-csum-reqd-no-csum.patch queue-6.6/mptcp-subflow-no-need-to-copy-thmac-during-ulp_clone.patch